jbig2dec ☆

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Description:
JBIG2 decoder and library (for monochrome documents)

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: jbig2 decoding image-processing pdf monochrome library

Install: brew install jbig2dec

About:
jbig2dec is a library and utility program that converts JBIG2 encoded images (commonly found in monochrome PDF documents) into more standard formats like PNG or TIFF. It provides a robust implementation of the JBIG2 decoding algorithm, enabling developers to extract and render bitmap images from compressed document sources. This tool is essential for processing legacy documents and integrating JBIG2 support into custom applications.

Key Features:

High-fidelity JBIG2 decoding to standard bitmap formats
Command-line utility for batch processing and testing
C-based library for integration into other software
Supports both lossy and lossless encoding modes
Open source implementation (AGPL/Apache licensed)

Use Cases:

Extracting images from PDF files containing JBIG2 compression
Building document management systems that require JBIG2 support
Converting legacy monochrome documents to modern image formats
Debugging and analyzing JBIG2 encoded data streams

Alternatives:

poppler – Poppler is a full PDF rendering library that includes JBIG2 decoding, whereas jbig2dec is a focused, lightweight library specifically for JBIG2 decoding.
mupdf – MuPDF is a lightweight PDF and XPS viewer/library that handles JBIG2 internally, while jbig2dec offers a standalone decoder for more targeted use cases.

Version History

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